soc/intel/alderlake: Add eMMC ACPI methods for Alder Lake N

Alder Lake N SOC has eMMC device. Add ACPI ASL methods for it.

Change-Id: I53f04e81584493049d37b46e078d394d3c8a2f09
Signed-off-by: Krishna Prasad Bhat <krishna.p.bhat.d@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61127
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>

src/soc/intel/alderlake/acpi/scs.asl

@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/pcr_ids.h>
+
+#define	PMCR_D0_MASK	0xFFFC
+#define	PMCR_D3_MASK	0x0003
+
+Scope (\_SB.PCI0) {
+
+	/*
+	 * Clear register 0x1C20/0x4820
+	 * Arg0 - PCR Port ID
+	 */
+	Method(SCSC, 1, Serialized)
+	{
+		PCRA (Arg0, 0x1C20, 0x0)
+		PCRA (Arg0, 0x4820, 0x0)
+	}
+
+	/* EMMC */
+	Device(PEMC) {
+		Name(_ADR, 0x001A0000)
+		Name (_DDN, "eMMC Controller")
+		Name(TEMP, 0)
+
+		OperationRegion(SCSR, PCI_Config, 0x00, 0x100)
+		Field(SCSR, WordAcc, NoLock, Preserve) {
+			Offset (0x84),	/* PMECTRLSTATUS */
+			PMCR, 16,
+			Offset (0xA2),	/* PG_CONFIG */
+			, 2,
+			PGEN, 1,	/* PG_ENABLE */
+		}
+
+		Method(_INI) {
+			/*
+			 * Clear eMMC timeout registers. _PS0 is not called by kernel when
+			 * boot source is not eMMC, but OS still initializes eMMC. So disable
+			 * timeout registers when boot source is not eMMC. Ported from CB:25290.
+			 */
+			SCSC (PID_EMMC)
+		}
+
+		Method(_PS0, 0, Serialized) {
+			Stall (50)	/* Sleep 50 us */
+
+			PGEN = 0	/* Disable PG */
+
+			/* Clear register 0x1C20/0x4820 */
+			SCSC (PID_EMMC)
+
+			/* Set Power State to D0 */
+			PMCR &= PMCR_D0_MASK
+			/* Additional config read to eMMC controller. Ported from CB:23312 */
+			TEMP = PMCR
+		}
+
+		Method(_PS3, 0, Serialized) {
+			PGEN = 1	/* Enable PG */
+
+			/* Set Power State to D3 */
+			PMCR |= PMCR_D3_MASK
+			/* Additional config read to eMMC controller. Ported from CB:23312 */
+			TEMP = PMCR
+		}
+
+		Device (CARD)
+		{
+			Name (_ADR, 0x00000008)
+			Method (_RMV, 0, NotSerialized)
+			{
+				Return (0)
+			}
+		}
+	}
+}

src/soc/intel/alderlake/acpi/southbridge.asl

@@ -26,6 +26,11 @@
 /* Serial IO */
 #include "serialio.asl"
 
+/* eMMC */
+#if CONFIG(SOC_INTEL_ALDERLAKE_PCH_N)
+#include "scs.asl"
+#endif
+
 /* SMBus 0:1f.4 */
 #include <soc/intel/common/block/acpi/acpi/smbus.asl>